The two versions of the computer. The two computers were started in the year 2500 BC when the transistor is used instead of vacuum tubes. By a transistor smaller than vacuum tube and use less electricity, computers, smaller and have a long service life. Although the transistor has been developed in the year 2491 but not transistor is used instead of vacuum tube widely in early. After the update and development of the first transistor in the last ten years of transistor started well enough with a performance that can be used to substitute for the vacuum tube. For memory, it has used the powerful science of magnetic and magnetic axis. (Magnetic disk) to store the data for recording, use a keyboard (keyboard)-2505 (1962) in the examples is a IBM 1401 (IBM 1401), which is highly popular and has more than 17000 engine implementation.
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